US7385681B2 - Gas leakage monitoring method and its system - Google Patents

Gas leakage monitoring method and its system Download PDF

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Publication number
US7385681B2
US7385681B2 US10/548,194 US54819405A US7385681B2 US 7385681 B2 US7385681 B2 US 7385681B2 US 54819405 A US54819405 A US 54819405A US 7385681 B2 US7385681 B2 US 7385681B2
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United States
Prior art keywords
image
light
gas
monitored
wavelength
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Expired - Fee Related, expires
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US10/548,194
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US20060238741A1 (en
Inventor
Hideki Ninomiya
Koji Ichikawa
Ken Kawahara
Hirofumi Miki
Tasuku Moriya
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Shikoku Research Institute Inc
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Shikoku Research Institute Inc
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Priority claimed from JP2003367905A external-priority patent/JP2004294423A/ja
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Assigned to SHIKOKU RESEARCH INSTITUTE INCORPORATED reassignment SHIKOKU RESEARCH INSTITUTE INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MORIYA, TASUKU, KAWAHARA, KEN, ICHIKAWA, KOJI, MIKI, HIROFUMI, NINOMIYA, HIDEKI
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/65—Raman scattering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
    • G01J3/36—Investigating two or more bands of a spectrum by separate detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/60—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature
    • G01J5/602—Radiation pyrometry, e.g. infrared or optical thermometry using determination of colour temperature using selective, monochromatic or bandpass filtering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/38—Investigating fluid-tightness of structures by using light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077—Imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/0014—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation from gases, flames
    • G01J5/0018—Flames, plasma or welding

Definitions

  • an optical band-path filter having the transmission wavelength center at each of wavelengths of OH-group emission spectrum lines i.e., for a light of each wavelength of 280 nm or 309 nm
  • an optical band-path filter having the transmission wavelength center at each of wavelengths of OH-group emission spectrum lines i.e., for a light of each wavelength of 280 nm or 309 nm
  • the objective lens 2 comprises a condenser lens, a relay lens, and a lens barrel (not shown) so that an image of the observation target can be formed on an imaging surface of the image intensifier 4 .
  • the optical band-pass filter 3 of the Raman scattering light adapted camera 11 a has the center of transmission wavelength for observing the wavelength of the Raman scattering light from the gas to be monitored.
  • the central wavelength for each kind of gas to be monitored is as shown in Table 1 given above.
  • the infrared light having passed through the light collecting optical system 30 A and the optical band-pass filter is converted into an electronic image by the thermo-camera 30 and then converted into a visible image.
  • the infrared image representing an infrared light distribution region captured by the thermo-camera 30 can also be visually observed by the naked eye through an eyepiece lens system.
  • the personal computer 10 is connected to the Raman scattering light adapted camera 11 a , the ultraviolet light adapted camera 11 b , the visible light adapted camera 12 , and a LAN 20 , and contains a monitoring control program 13 for executing monitoring control.
  • the monitoring control program 13 includes an image processing program 14 for controlling image processing executed in the Raman scattering light adapted camera 11 a , the ultraviolet light adapted camera 11 b , the visible light adapted camera 12 , and the thermo-camera 30 .
  • the laser beam and the Raman scattering light are introduced through respective optical fiber cables. Therefore, this embodiment is suitable for detecting leakage gas in, e.g., a dead space of a structure or a closed conduit.
  • the laser beam is irradiated through one optical fiber, and the Raman scattering light and the background light are focused at an end face of another optical fiber through a focusing lens.
  • a half mirror allowing an ultraviolet light to pass through the mirror is used to introduce the Raman scattering light from the target gas to the Raman scattering light adapted camera for picking up an image of the leakage gas, while the background image is introduced to the visible light adapted camera so that optical axes of both the cameras are aligned with each other.
  • FIG. 21 shows the configuration of an embodiment of a laser-scanned gas leakage monitoring system according to the present invention.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Biochemistry (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Examining Or Testing Airtightness (AREA)
US10/548,194 2003-03-07 2004-03-05 Gas leakage monitoring method and its system Expired - Fee Related US7385681B2 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP2003-060820 2003-03-07
JP2003060820 2003-03-07
JP2003290329 2003-08-08
JP2003-290329 2003-08-08
JP2003367905A JP2004294423A (ja) 2003-03-07 2003-10-28 火炎監視システム
JP2003-367905 2003-10-28
PCT/JP2004/002868 WO2004079350A1 (ja) 2003-03-07 2004-03-05 ガス漏洩監視方法、及びそのシステム

Publications (2)

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US20060238741A1 US20060238741A1 (en) 2006-10-26
US7385681B2 true US7385681B2 (en) 2008-06-10

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US (1) US7385681B2 (de)
EP (2) EP2511611A1 (de)
CA (1) CA2518491C (de)
WO (1) WO2004079350A1 (de)

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US20110018996A1 (en) * 2009-07-23 2011-01-27 Mian Zahid F Area Monitoring for Detection of Leaks and/or Flames
CN102609907A (zh) * 2012-01-12 2012-07-25 北京理工大学 基于自适应时域滤波和形态学的气体红外图像增强方法
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US10408763B2 (en) 2015-01-30 2019-09-10 Mécanique Analytique Inc. Systems and methods for testing for a gas leak through a gas flow component
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US20060238741A1 (en) 2006-10-26
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